Preparation method for solar cell piece unit and solar cell module

A solar cell module, comprising:

• at least one solar cell piece unit group that is arranged in the longitudinal or transverse direction, wherein each solar cell piece unit group comprising at least two cell piece units, wherein the cell piece units connected in one string are sequentially arranged in an overlapped manner, wherein each cell piece unit comprises a front surface and a back surface, wherein the front surface is provided with a power generation area and front main gate lines disposed at an edge of one side of the power generation area, wherein a plurality of thin gate lines is disposed on the power generation area, and the thin gate lines are connected to the front main gate lines, wherein the back surface is provided with back main gate lines and an aluminum back field, and the front main gate lines and the back main gate lines are located on two opposite sides of the cell piece unit, wherein the front main gate line and the back main gate line of each cell piece unit are respectively bonded and conductively connected to the back main gate line of one adjacent cell piece unit, and the front main gate line of the other adjacent cell piece unit.